Bone screw revision tools and methods of use

• US 20070270880A1
• Filed: 04/28/2006
• Published: 11/22/2007
• Est. Priority Date: 04/28/2006
• Status: Abandoned Application

• Current Assignee: Warsaw Orthopedic Incorporated (Medtronic Plc)
• Original Assignee: SDGI Holdings Incorporated (Medtronic Plc)
• Inventors: Ferguson, Joe, Lindemann, Gary, Paul, Marc
• Application Number:
  US11/413,279
• Publication Number:
  US 20070270880A1
• Time in Patent Office: Days
• US Class Current: 606/104
• CPC Class Codes: A61B 17/8042 the additional component being a cover over the screw head
• CPC Class Codes: A61B 17/861 specially shaped for gripping driver
• CPC Class Codes: A61B 17/8888 at its central region
• CPC Class Codes: A61B 17/8891 at its periphery
• CPC Class Codes: B25B 15/02 operated by rotating the handle
• CPC Class Codes: B25B 23/108 the driving bit being a Philips type bit, an Allen type bit or a socket

Abstract

The present application is directed to tools that may generally deflect a locking ring away from the fastener, and also engage a head of the fastener to rotate and remove the fastener from a vertebral member. The tools may include a first member that contacts and moves the locking ring away from the aperture 101. A second member engages the head and transfers torque to the fastener for removal from the vertebral member.

Claims

1. An orthopedic instrument for revising a screw coupling a bone plate to a bone, the instrument comprising:

an elongate member having a handle at a proximal end and a screw engagement portion at a distal end, the screw engagement portion adapted to expand to engage a screw head; and

a sleeve coupled to the elongate member;

wherein the sleeve is adapted to deflect a screw retention device.

2. The instrument as in claim 1 wherein the screw engagement portion comprises first and second tip portions having a hexagonal shape when in a first position.

3. The instrument as in claim 2 wherein the first and second tip portions are spaced apart when the tip portions are in a second position.

4. The instrument as in claim 3 comprising a tension device adapted to bias the first and second tip portions towards the second position.

5. The instrument as in claim 3 further comprising a lever coupled to the first and second tip portions for transferring the tip portions to the first position.

6. The instrument as in claim 1 wherein the screw engagement portion comprises first and second tip portions having a circumferential ridge.

7. The instrument as in claim 6 wherein the circumferential ridge is adapted to engage a recess in the screw head.

8. The instrument as in claim 7 wherein the circumferential ridge is adapted to engage a circumferential groove in the screw head recess.

9. The instrument as in claim 7 wherein the circumferential ridge is adapted to frictionally engage the screw head recess.

10. The instrument as in claim 1 wherein the sleeve is rotatably coupled to the elongate member.

11. The instrument as in claim 1 wherein the sleeve is removably coupled to the elongate member.

12. The instrument as in claim 1 wherein the sleeve comprises a distal tip extending around at least a portion of a sleeve circumference.

13. The instrument as in claim 12 wherein the sleeve is adapted to rotate relative to the screw engagement portion, the distal tip adapted to deflect the screw retention device.

14. The instrument as in claim 12 wherein the sleeve is axially translatable relative to the screw engagement portion to translate the distal tip beyond a distal end of the screw engagement portion.

15. The instrument as in claim 1 wherein the sleeve comprises a distal end having outer and inner edges, the outer edge being adapted to engage the screw retention device and the inner edge being adapted to engage the screw head.

16. The instrument as in claim 15 wherein the inner edge is an undercut inner edge.

17. The instrument as in claim 15 wherein the inner edge comprises a lip adapted to engage the screw head.

18. A tool for removing a screw from an orthopedic plate of the type having at least one aperture therein for receiving the screw, the plate having a screw retaining member engaging a head of the screw, the tool comprising:

a handle;

an elongate sleeve member rotatably coupled to the handle, the sleeve member having a proximal end and a distal end, the sleeve member distal end having an outer edge and an inner edge;

wherein the sleeve member outer edge is adapted to translate the screw retaining member away from the screw head when the sleeve is rotated relative to the handle; and

wherein the sleeve inner edge is adapted to grip an outer surface of the screw head.

19. The tool as in claim 18 wherein the sleeve inner edge comprises a foot member adapted to engage a groove in the screw head.

20. The tool as in claim 18 wherein the sleeve inner edge comprises an angled edge adapted to engage a groove in the screw head.

21. A tool for removing a screw from an orthopedic plate of the type having at least one aperture therein for receiving the screw, the plate having a screw retaining member engaging a head of the screw, the tool comprising:

a first elongate member rotatably coupled to a second elongate member in a generally coaxial configuration;

the second elongate member comprising a distal tip for engaging a tool-receiving recess in the screw head; and

wherein the first elongate member is adapted to extend outside a periphery of the screw head to engage the screw retaining member.

22. The apparatus as in claim 21 wherein the distal tip of the second elongate member comprises a left-hand threaded tip.

23. The apparatus as in claim 21 wherein the distal tip of the second elongate member comprises flutes that tap into a head of the screw.

24. The apparatus as in claim 21 wherein the distal tip of the second elongate member comprises a split hex tip.

25. The apparatus as in claim 21 wherein the first member further comprises a notch adapted to receive an edge of the screw retaining member, the first member adapted to translate the screw retaining member away from the screw head upon rotation of the notch away from the screw retaining member.

26. The instrument as in claim 21 wherein the first elongated member is removably coupled to the second elongate member.

27. A method of removing a screw from an orthopedic plate, the plate having a screw retention device engaging a portion of a head of the screw, the method comprising:

providing a screw revision tool comprising;

an elongate member having a handle at a proximal end and a screw engager at the distal end; and

a sleeve coupled to the elongate member;

translating the screw retention device away from the screw head with the sleeve;

gripping the screw head with the screw engager; and

axially translating the screw with the screw engager while the sleeve maintains the screw retention device away from the screw head.

28. The method as in claim 27 wherein translating the screw retention device comprises rotating the sleeve.

29. The method as in claim 27 wherein gripping the screw head comprises engaging a recess in the screw head with the screw engager, the screw engager comprising a split tip.

30. The method as in claim 29 wherein engaging the recess comprises inserting the split tip into the recess when the split tip is in a first position, and expanding the split tip to a second position to engage the recess.

31. The method as in claim 27 wherein the screw engager comprises a left-hand threaded tip, and wherein gripping the screw head comprises screwing the threaded tip into the screw head.

32. The method as in claim 31 wherein screwing the screw engager threaded tip into the screw head creates a threaded engagement between the screw head and tip.

33. The method as in claim 32 wherein the screw engager threaded tip is a self drilling threaded tip.

34. The method as in claim 27 wherein gripping the screw head comprises engaging a periphery of the screw head with the screw engager.

35. The method as in claim 34 wherein the screw engager comprises a lip to engage the screw head periphery.

36. The method as in claim 27 wherein the sleeve is rotatably and removably coupled to the elongate member.

37. The method as in claim 27 wherein the screw is stripped in a bone.

38. The method as in claim 37 wherein the bone is a vertebral body.